1  // Copyright (C) 2019-2025 ADnet Contributors
 2  // This file is part of the ADL library.
 3  
 4  // The ADL library is free software: you can redistribute it and/or modify
 5  // it under the terms of the GNU General Public License as published by
 6  // the Free Software Foundation, either version 3 of the License, or
 7  // (at your option) any later version.
 8  
 9  // The ADL library is distributed in the hope that it will be useful,
10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  // GNU General Public License for more details.
13  
14  // You should have received a copy of the GNU General Public License
15  // along with the ADL library. If not, see <https://www.gnu.org/licenses/>.
16  
17  use crate::{Expression, Node, NodeID, NonNegativeNumber};
18  use adl_span::Span;
19  
20  use serde::{Deserialize, Serialize};
21  use std::fmt;
22  
23  /// A tuple access expression, e.g., `tuple.index`.
24  #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
25  pub struct TupleAccess {
26      /// An expression evaluating to some tuple type, e.g., `(5, 2)`.
27      pub tuple: Expression,
28      /// The index to access in the tuple expression. E.g., `0` for `(5, 2)` would yield `5`.
29      pub index: NonNegativeNumber,
30      /// The span for the entire expression `tuple.index`.
31      pub span: Span,
32      /// The ID of the node.
33      pub id: NodeID,
34  }
35  
36  impl fmt::Display for TupleAccess {
37      fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
38          write!(f, "{}.{}", self.tuple, self.index)
39      }
40  }
41  
42  impl From<TupleAccess> for Expression {
43      fn from(value: TupleAccess) -> Self {
44          Expression::TupleAccess(Box::new(value))
45      }
46  }
47  
48  crate::simple_node_impl!(TupleAccess);